CN101836390B - Method and device for data processing and communication system comprising such device - Google Patents
Method and device for data processing and communication system comprising such device Download PDFInfo
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- CN101836390B CN101836390B CN200880112829.3A CN200880112829A CN101836390B CN 101836390 B CN101836390 B CN 101836390B CN 200880112829 A CN200880112829 A CN 200880112829A CN 101836390 B CN101836390 B CN 101836390B
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L1/00—Arrangements for detecting or preventing errors in the information received
- H04L1/12—Arrangements for detecting or preventing errors in the information received by using return channel
- H04L1/16—Arrangements for detecting or preventing errors in the information received by using return channel in which the return channel carries supervisory signals, e.g. repetition request signals
- H04L1/18—Automatic repetition systems, e.g. Van Duuren systems
- H04L1/1812—Hybrid protocols; Hybrid automatic repeat request [HARQ]
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L1/00—Arrangements for detecting or preventing errors in the information received
- H04L1/12—Arrangements for detecting or preventing errors in the information received by using return channel
- H04L1/16—Arrangements for detecting or preventing errors in the information received by using return channel in which the return channel carries supervisory signals, e.g. repetition request signals
- H04L1/18—Automatic repetition systems, e.g. Van Duuren systems
- H04L1/1867—Arrangements specially adapted for the transmitter end
- H04L1/1874—Buffer management
Abstract
A method and a device for data processing in a network comprising a first network element and a second network element are provided, the method comprising the following steps of (a) the second network element provides a control information to the first network element; (b) a portion of data sent from the first network element to the second network element is identified by said control information; and (c) upon identification of said portion of data a retransmission from the first network element to the second network element can be initiated.
Description
Technical field
The present invention relates to for the method and apparatus of data processing and relate to the communication system that comprises this equipment.
Background technology
DSL (digital subscriber line (Digital Subscriber Line)) is that the technology family of digital data transfer is provided by the wire of phone Access Network.DSL technology is usually called " xDSL ", and wherein, " x " represents various DSL modification.
Asymmetrical Digital Subscriber Line (ADSL, ITU-T are G.992.1) is a kind of form of DSL, can provide a kind of making it possible to by copper telephone line, to carry out quickly the data communication technology of transfer of data than traditional voice band modulation demodulator.This type of fast transport is by utilizing the common obsolete frequency of voice telephone calls, the especially frequency higher than normal person's hearing to realize.
ADSL2 (ITU-T G.992.3) and ADSL2+ (ITU-T G.992.5) are the modification of ADSL, and both compare better performance is all provided with basic ADSL.
VDSL (ultrahigh speed DSL, ITU-T are G.993.1) and VDSL2 (ultrahigh speed DSL2, ITU-T are G.993.2) are to the xDSL technology of transfer of data even is faster provided by single twisted-pair feeder.This is mainly by using larger frequency range to realize.
The utilization of xDSL technology designed to be used the existing infrastructure of the copper cash of plain old telephone service (POTS) at first.Can from central office (CO (Central Office)), for example from be preferably located near customer rs premise (customer premise) or building in fiber-fed cabinet (fiber-fed cabinet) it is disposed.
Practical communication path is because basic physical law has loss and mistake.In digital world, when the error rate is less than 10
-12and packet loss rate is better than 10
-8time, conventionally link is considered as to high-quality.
Yet, because technical limitations exists, there is the obviously communication link of the error rate of higher (worse).This type of example is that exemplary packet loss late is greater than 10
-5dSL circuit.
Some application tolerable packet loss or error code, but a lot of application requirements error rate is no better than zero.In this case, use re-transmission or forward error correction (FEC, Forward ErrorCorrection) to overcome the problem of loss or defective grouping.
To losing the real-time streaming transmission that an example of quite responsive application is video content.Here, single packet loss causes resembling (artefact) visible mistake on TV screen as puppet.The application requirement per second of high definition TV (HDTV) is divided into groups in a large number, if the basic grouped Loss Rate of application DSL, this resembles the puppet that causes unacceptable number.
Known transmission control protocol (TCP) increases expense by the data to transmitting provides re-transmission (retransmission) ability.It needs the complex process at transmitter and receiver place needs to confirm that grouping is along the flowing of inverse direction, thereby also to reverse or feedback channel increase overhead data.
The expense of being introduced by TCP is along grouping (forwarded packet) 20 bytes (TCP header) of each forwarding of forward direction (forwarding) direction with along grouping 64 bytes (TCP acknowledgment grouping) of each forwarding of inverse direction.Because TCP is end-to-end protocol, so it introduces delay in the data flow forwarding, this postpones the round-trip delay higher than whole end-to-end link path.As a result, if application needs real-time streaming to transmit and depends on retransmission capabilities, TCP introduces the delay more than a second to internet application.
TCP does not follow multicast distribution.As a result, it can not be for the application of IPTV (IPTVover DSL) on DSL for example and so on.
Summary of the invention
The problem solving is to overcome shortcoming as above, the solution that especially provides a kind of DSL that allows to utilize efficiently the high quality applications that is even suitable for similar HDTV to connect.
According to the feature of independent claims, solve this problem.From dependent claims, obtain other embodiment.
In order to overcome this problem, provide a kind of for comprising the method for data processing of the network of first network element and second network element, the method comprises the following steps:
(a) second network element provides control information to first network element;
(b) by described control information, identify the data division that sends to second network element from first network element;
(c) when the described data division of identification, can initiate the re-transmission from first network element to second network element.
Therefore, first network element can when receiving control information, determine at receiver place correctly or at least a portion of the data that receive improperly (for example packet or Frame) thus and determine that it may need to retransmit.
It should be noted that described data division can comprise at least a portion of data.Especially, can carry out organising data with (a plurality of) frame and/or grouping.
The method has the following advantages especially:
-packet loss rate can be improved at least three orders of magnitude;
-the method allows the interoperability of used equipment and new equipment (possessing and do not possess the equipment of this machine-processed ability);
-feedback channel only needs low-down bandwidth;
-the method is to not needing to retransmit but other service of delay-sensitive is only had to minimum influence;
-in addition, the method needs minimum protocol overhead at second network element (receiver), especially DSL modulator-demodulator place;
-needn't increase the bandwidth along forward direction, for example, because do not need to be additional to along forward direction the additional data (header) of regular data (regular data);
-in the first network element of for example DSLAM, only have appropriate protocol overhead;
-the method can realize in software, therefore can easily by firmware, more be newly arrived existing second network component equipment (receiver, DSL modulator-demodulator) is upgraded;
-the method that provides allows the short stand-by period.
The method providing can utilize first network element to be connected (or xDSL connects or derivatives thereof) with the DSL between second network element especially.
In addition, first network element and second network element can be the network elements utilizing in the network of Ethernet protocol, especially, can implement these as the part of end-to-end connection or the hop-by-hop of section (hop-to-hop) and connect.
In an embodiment, can utilize the method in data link layer or physical layer.
In another embodiment, described network is the network that utilizes Ethernet protocol.
In another embodiment, first network element comprises for storing the buffer of at least a portion of data.
This buffer can also be called and/or as re-transmission buffer.
In next embodiment, with grouping and/or frame, carry out organising data at least in part.
According to another embodiment, via digital subscriber line, connect first network element and second network element.
Digital subscriber line can comprise any derivative (xDSL, VDSL, ADSL etc.) of DSL.
According to embodiment, control information is especially by utilizing one of the following to carry out at least a portion of identification data:
-one-way function;
-hash function (hash-function);
-code, especially CRC code.
Therefore, can make in all sorts of ways or function by data (preferably, its frame or grouping) be mapped to given expression or fingerprint (fingerprint), this preferably needs bandwidth seldom, be sent to first network element (preferably via feedback channel) from second network element.
According to another embodiment, at least one during step (c) is further comprising the steps of:
If-former subordinates at the described data division of first network element place identification corresponding to the data in the storage of first network element place divides, the former subordinates of deleting these data at first network element place divides;
If-at the described data division of first network element place identification, be not stored in first network element place, hold fire;
If-at the described data division of first network element place identification corresponding to not being the data division that the former subordinates in the data of first network element place storage divides, at first network element place, delete the data division of current identification, and the data division older than the data division of this current identification retransmitted to second network element from first network element.
In another embodiment, described control information is identified at least a portion of the data that second network element place is not successfully received.
Especially, described control information can be included in the CRC content that second network element place receives and the CRC content of calculating according to the data that receive.
As another embodiment, described control information comprises first content, the CRC content especially receiving at second network element place, and second content, the CRC content especially calculated according to the data that receive at second network element place.
Therefore, this type of CRC content all can be used as control information and is transported to first network element to first network element can be determined be sent to data or the CRC of second network element whether incorrect.
It should be noted code or fingerprint rather than the CRC code that can utilize any other kind.
According to next embodiment, first network element utilizes control information to determine the described data division successfully not transmitted.
According to another embodiment, if be transported to the first content of first network element and/or second content with the content of being determined by first network element, especially CRC content is not mated via described control information for the specific part of data, first network element retransmits described data division.First content can be included in the CRC content that second network element place receives especially.Second content can comprise the CRC content of being calculated by second network element according to the data that receive especially.
Can by first network element, determine CRC content especially, for example, calculate and/or resolve (resolve) and/or by relatively coming to determine.
According to another embodiment, at least one during step (c) is further comprising the steps of:
If-at the described data division of first network element place identification corresponding to being identified as unsuccessful the data that receive at second network element place, first network element retransmits to second network element by this data division.
As another embodiment, first network element and/or second network element are digital subscriber line access multiplex (DSLAM, digital subscriber line access multiplexer).
Also have an embodiment, second network element is customer rs premise equipment, especially DSL modulator-demodulator.
Also by the equipment for data processing that comprises processor unit, solve the problems referred to above, described processing unit is assembled and/or is arranged so that on described processor unit, to carry out method as herein described.
According to embodiment, this equipment is communication equipment, especially network element.Preferably, described equipment can be DSLAM or DSL modulator-demodulator.
Also by the communication system that comprises equipment described herein, solve the problems referred to above.
Accompanying drawing explanation
Shown in figure below and embodiments of the invention have been described:
Fig. 1 is the framework of repeating method or design;
How Fig. 2 can be divided into frame payload and CRC if illustrating.
Embodiment
Solution provided herein can be revised the behavior (behavior) of DSLAM and DSL modulator-demodulator especially in data link layer.A special object is to retransmit breakage (corrupted) Frame (or packet), wherein, can make protocol overhead minimize.
This method does not guarantee the successful re-transmission for possible any error code especially, but successful re-transmission is in most of the cases provided.
For example, if retransmitted in 999/1000 error code event, be successfully, total bit error rate or packet loss rate can be improved to three orders of magnitude, this is enough for a lot of application.
In addition, protocol overhead is extremely little and in receiver, need little processing expenditure.
This solution can be based on Ethernet protocol, but its especially applicable to utilize for the verification of Frame and/or packet and any agreement.
The basic framework that retransmits design is shown in Figure 1, it comprises first network element 101 (transmitter for example, DSLAM) and second network element 102 (for example, receiver, can be especially the DSL modulator-demodulator of customer rs premise equipment (CPE)) especially.First network element 101 sends data via data channel 103 (forward channel) and second network element sends data via feedback channel 104 (inverse direction).Direction from first network element 101 to second network element 102 can also be called to descending (downstream) direction, and rightabout can be called up direction.
Yet, method as herein described applicable to up direction and down direction both.
The frame successfully receiving for each, receiver 102 sends it back control information, acknowledgement frame especially, the fingerprint that it comprises the frame receiving.
Fingerprint can for example have 2 byte lengths, thereby obviously reduces the expense of carrying via feedback channel 104.
Advantageously, may not need to via the expense along forward direction of data channel 103, receiver 102 can generate fingerprint one's very own, for example, as the verification receiving via (across) regular payload data and.
The content of acknowledgement frame can comprise the fingerprint of frame.Transmitter 101 is compared this fingerprint with the fingerprint that is stored in the frame in its buffer (especially re-transmission buffer).Transmitter can advantageously be removed coupling frame from its re-transmission buffer.
Preferably, the frame transmitting is stored in described re-transmission buffer according to transmission sequence.Therefore, the acknowledgement frame in most of the cases receiving is associated with the oldest buffer entries, because DSL environment (one by one) process frames of data in order.
The in the situation that of packet loss, the acknowledgement frame receiving at transmitter 101 places can relate to and not correspond to the Frame of old buffer entries.As exemplary algorithm, can process as follows various situations:
(1) acknowledgement frame receiving at transmitter place relates to the legacy data frame being stored in re-transmission buffer: the entry of this legacy data frame is deleted from re-transmission buffer.
(2) acknowledgement frame receiving at transmitter place does not mate with the Frame being stored in re-transmission buffer: hold fire.
(3) acknowledgement frame receiving at transmitter place relates to the Frame N being stored in re-transmission buffer, described Frame is not the oldest entry in re-transmission buffer: the entry of this Frame N is deleted from re-transmission buffer, and is stored in the older Frame of Frame N described in the ratio in re-transmission buffer and is retransmitted to receiver.
Therefore (4) transmitter is wanted to transmit subsequent data frame and this follow-up data is cushioned, but re-transmission buffer is full: the entry of this legacy data frame is deleted from re-transmission buffer; The new entry of this reality (follow-up) Frame is added to buffer.
If data link layer protocol is Ethernet, for the object ethernet frame of the method, can provide the verification being utilized and.
Ethernet protocol provides the crc field of two bytes in ending place of this Frame.This crc field can be used as fingerprint, wherein, can significantly reduce the processing expenditure in receiver.
Therefore, acknowledgement frame comprises these 2 bytes and than regular ethernet frame much shorter.Because (in DSL environment) all frames are separated with each other start byte and stop byte, so can advantageously transmit this type of short frame along inverse direction.Transmitter can be by checking that frame length differentiates regular data frame and acknowledgement frame easily.If frame length equals for example 4 bytes (fingerprint and regular CRC, each comprises the length of 2 bytes), transmitter detects acknowledgement frame.In the situation that frame length equals or comprise more than 64 bytes, this frame is considered as to regular data.
In addition or as the replacement of the embodiment that provides, control information can be identified at least a portion of the unsuccessful payload data receiving in second network element 102 places (especially Frame and/or packet).
Advantageously, these two crc values are all returned to transmitter 101, because receiver 102 does not know that breakage relates to effectively meet data (crc field inerrancy) or crc value (payload data inerrancy).
" payload " herein relates to the data of the frame that there is no crc field especially, as shown in Figure 2.
Because the crc value of ethernet frame has 2 bytes and only sends NAK frame the unsuccessful transmission in the situation that, so quite little along the required bandwidth of inverse direction 104.Along forward direction 103, do not need overhead data.
The described NAK frame of transmitter 101 use determines which packet and/or frame are not successfully transmitted.Then retransmit this particular data frame.
NAK frame can advantageously comprise two crc values, and wherein, one of those two crc values are correct.Transmitter 101 is compared two crc values and is retransmitted the Frame of coupling with the CRC that is stored in the Frame in the re-transmission buffer of transmitter 101.
Preferably, re-transmission buffer is stored it in order according to the transmission of transmitted Frame.Therefore,, if send NAK frame from receiver 102 to transmitter 101, for the oldest damaged during the transmission buffer entries, send.In the DSL environment of strict order that keeps Frame, situation is especially true.
As exemplary algorithm, can process as follows various situations:
(1) Frame in the re-transmission buffer of one of two crc values carrying with NAK frame and transmitter mates: this Frame is sent out thinks highly of biography.
(2) each in two crc values carrying with NAK frame is mated (that is, having identified two Frames) with the independent Frame in the re-transmission buffer of transmitter: by default, retransmit the oldest Frame.
Therefore (3) transmitter is wanted to transmit subsequent data frame and this follow-up data is cushioned, but re-transmission buffer is full: the entry of this legacy data frame is deleted from re-transmission buffer; The new entry of this reality (follow-up) Frame is added to buffer.
NAK frame preferably includes payload (two crc values) and 2 byte crc values (being additional to regularly each ethernet frame) of 4 bytes, and is therefore significantly shorter than regular ethernet frame.
Because (in DSL environment) all frames are separated with each other start byte and stop byte, so can advantageously transmit this type of short frame along inverse direction.Transmitter can be by checking that frame length differentiates regular data frame and NAK frame easily.If frame length equals for example 6 bytes (4 byte payloads and 2 byte rule CRC), transmitter detects NAK frame.In the situation that frame length equals or comprise more than 64 bytes, this frame is considered as to regular data.
The details of other embodiment:
(1)
the back compatible of DSL modulator-demodulator (Backward compatibility):
If DSL modulator-demodulator is not supported proposed retransmission algorithm, it will be not send this type of 4 byte frame (being 6 bytes the NAK frame in the situation that) along up direction.As a result, will not there is not re-transmission.Therefore, any new DSLAM (support retransmission algorithm) and old DSL modulator-demodulator can carry out interoperability without any need for configuration or auto negotiation (auto-negotiation) in the situation that.
(2)
re-transmission for uplink service:
According to the exemplary cases of setting forth, may only protect downlink business above.Yet, can be along up direction or simultaneously for both direction use the method and/or algorithm.
(3)
aCK LOF
Algorithm process contingent most of error conditions on DSL of proposing.Yet this loses or damaged situation when being carried via backward channel may acknowledgement frame.In this case, retransmitting data frame receiving twice at receiver place unnecessarily.Great majority application (for example, based on TCP or based on RTP) can process frames of data this type of copy, especially due to its identical sequence number.If exist can not process frames of data this type of application copying, the data flow of this type of application can be got rid of from retransmit to (4) that vide infra.
(4)
for some application, enable/forbid re-transmission:
Described algorithm retransmits and is temporarily stored in the Frame in re-transmission buffer.If Frame not (or no longer) is stored in re-transmission buffer, corresponding acknowledgement frame will make algorithm know this point (referring to above: hold fire in this case).
Therefore, transmitter can judge which frame will be cushioned or not cushion.For example, transmitter can monitor TCP layer and get rid of all these type of Frames that buffering has specific T CP port.
This type of tcp port number is only example.Can be with transmitter addressable and/or any filtering rule applicatory forbid or enable re-transmission.
Advantageously, this category feature does not cause any processing expenditure to receiver.
This corresponding NAK frame that is applicable to.
(5)
fingerprint collision:
Another problem of using the algorithm that acknowledgement frame (not being NAK frame) sets forth is that subsequent frame may have different payload but lead to (quite low) probability of (lead to) identical fingerprints.
If the first Frame (having fingerprint ' k ') loss/breakage during fl transmission, does not retransmit this Frame.As an alternative, retransmit the second Frame (also thering is fingerprint ' k '), even there is not error code in this frame inside.
Yet this is regarded as minor issue, even because only selected 2 byte fingerprints, this is less than 10 by what cause occurring two same number of frames
-4probability.Result is that packet loss rate is improved at least 4 orders of magnitude, and this is enough in many cases.
Certainly, can be by providing more accurate fingerprint to reduce the probability of two same number of frames.For example, the fingerprint of 4 byte lengths can be reduced to the probability of fingerprint collision lower than 10
-9value.
(6)
nAK LOF:
The method providing is processed contingent most of error conditions on DSL.Yet NAK frame itself may be lost or be damaged when being carried via backward channel.In this case, do not retransmit.The probability of this event is very little, and is about the product with packet loss rate along inverse direction along the packet loss rate of forward direction.For example,, if DSL has 10
-5packet loss rate, this event has and is about 10
-10probability, this is in most of the cases insignificant.
(7)
payload and CRC are damaged:
In this case, NAK frame does not mate with the entry of the re-transmission buffer of transmitter.Therefore, retransmitting data frame not.Yet this type of wrong probability is quite little.
(8)
dual Matching in buffer:
If each CRC of NAK mates (having identified two frames) with the frame in buffer, transmitter be can not determine and will be retransmitted which in two Frames.According to acquiescence, transmitter retransmits the highest (that is, the oldest) frame.
Use this default setting, can solve half of those (quite unlikely) situations.
Yet this is minor issue, because the probability of this type of Dual Matching is less than 10 for 2 byte crc values
-4.As a result, packet loss rate is improved at least 4 orders of magnitude, this is in most of the cases enough.
(9) mistake in forward path makes two frames come from one (make two frames out ofone):
This may in the middle of Frame and/or packet, add at error code wrong initial/occur while stopping sequence.
Therefore,, if use the algorithm with NAK frame, receiver will send NAK frame and send another NAK frame for the second half of packet for the first half of packet.
Last NAK frame will be identified by transmitter, and will initiate the correct re-transmission of partial data grouping (Frame).
other advantage:
The method providing demonstrates following advantage especially:
-for forward path, do not produce protocol overhead (for example, header).Therefore, do not need to increase forward direction bandwidth.
-very little for the expense of reverse path, because the size of acknowledgement frame can only equal 4 bytes especially.The in the situation that of NAK frame, the size of expense equals 6 bytes.
It is each Frame or packet generation fingerprint independently of each other that-receiver and transmitter can use cyclic redundancy check (CRC) (CRC).This type of hardware that possesses CRC ability for example can be used for, in data link layer device (ethernet mac).
-can be quite little in the additional treatments of receiver place needs.Therefore, can only by making the firmware upgrade of existing receiver, not need to provide the new receiver hardware with more multiprocessing ability to realize described algorithm (for example, for IPTV the upgrading of disposing ADSL2+CPE).
-for example, the susceptibility according to application to the shake being caused by re-transmission (jitter), can enable/forbid re-transmission for some application.
-transmitter does not need to know whether receiver can process the retransmission protocol of proposal.Have and do not have the transmitter of realization of described retransmission protocol and any combination of receiver can without any need for configuration and/or auto negotiation in the situation that, carry out interoperability.
-by the delay of the re-transmission introducing of proposing, be to form the little two-way time also only being connected by DSL.
-the method that provides is applicable to up and/or down direction.
-the method that provides can be applied at Ethernet (based on ATM's) ADSL2+ (as in the situation that the IPTV application on ADSL2+) during in the operation of the top of ATM.
-can use the mechanism of NAK frame for so any host-host protocol, this host-host protocol provides and/or allows verification and especially via the transmission of the payload of its Frame.
-can will use the mechanism of acknowledgement frame for any host-host protocol.
Claims (17)
1. for the method for data processing comprising the network of first network element and second network element, wherein with frame, organize described data, the method comprises the following steps:
-Frame is sent to second network element from first network element;
-described second network element provides control information to first network element;
The Frame that-first network element is identified correctly and/or received improperly by described control information;
-in when identification, initiate the re-transmission of damaged Frame from first network element to second network element,
It is characterized in that,
Described control information is included in the CRC content that second network element place receives.
2. the method for claim 1, at data link layer place or physical layer place utilize the method.
3. the method as described in any one in aforementioned claim, wherein, described network is used Ethernet protocol.
4. method as claimed in claim 1 or 2, wherein, first network element comprises the buffer for store frames of data.
5. method as claimed in claim 1 or 2, wherein, connects first network element and second network element via digital subscriber line.
6. method as claimed in claim 1 or 2, at least one in further comprising the steps of:
If-the Frame that is identified as correct reception at first network element place corresponding to the legacy data frame in the storage of first network element place, is deleted this legacy data frame at first network element place;
If-at the Frame of first network element place identification, be not stored in first network element place, hold fire;
If-the Frame that is identified as correct reception at first network element place is corresponding to not being Frame at the legacy data frame of first network element place storage, at first network element place, delete the Frame of current identification, and the Frame older than the Frame of this current identification retransmitted to second network element from first network element.
7. method as claimed in claim 1 or 2, wherein, if the CRC content that is transported to first network element via described control information for specific Frame is not mated with the CRC content of being determined by first network element, first network element retransmits described Frame.
8. method as claimed in claim 1 or 2, wherein, described control information comprises the CRC content of being calculated by second network element according to the data that receive.
9. method as claimed in claim 1 or 2, wherein first network element compares the CRC content being comprised by control information and the CRC content that is stored in the Frame in buffer.
10. method as claimed in claim 1 or 2, wherein, first network element and/or second network element are digital subscriber line access multiplex (DSLAM).
11. methods as claimed in claim 1 or 2, wherein, second network element is customer rs premise equipment.
12. methods according to claim 11, wherein, second network element is DSL modulator-demodulator.
13. 1 kinds for the equipment of data processing comprising the network of first network element and second network element, wherein with frame, organizes described data, and this equipment comprises:
-for Frame is sent to the device of second network element from first network element,
Wherein said second network element provides control information to first network element;
The Frame that wherein first network element is identified correctly and/or received improperly by described control information;
For the device of initiating the re-transmission of damaged Frame from first network element to second network element when identifying,
It is characterized in that,
Described control information is included in the CRC content that second network element place receives.
14. 1 kinds of network equipments for the data processing of network, wherein organize described data with frame, comprising:
-for the device from the described network equipment to another network equipment transmit data frames;
-for the device of the control information being provided for the described network equipment by described another network equipment is provided, this control information is included in the CRC content that described another network equipment place receives;
-for the device of the Frame being identified by described control information correctly and/or receive improperly; And
-device for initiating the re-transmission of damaged Frame from the described network equipment to described another network equipment in when identification.
15. network equipments as claimed in claim 14, wherein, described equipment is DSLAM.
16. 1 kinds of network equipments for the data processing of network, wherein organize described data with frame, comprising:
-for receiving the device of the Frame being transmitted by another network equipment;
-for the device of control information is provided to described another network equipment, this control information is included in the CRC content that described network equipment place receives, and is configured to make it possible at described another network equipment place identified correctly and/or the Frame receiving improperly and initiate the re-transmission of damaged Frame from described another network equipment to the described network equipment when the identification by described control information.
17. network equipments according to claim 16, wherein said equipment is DSL modulator-demodulator.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| EP07020700.6 | 2007-10-23 | ||
| EP20070020700 EP2053774B1 (en) | 2007-10-23 | 2007-10-23 | Method and device for data processing and communication system comprising such device |
| PCT/EP2008/064277 WO2009053386A1 (en) | 2007-10-23 | 2008-10-22 | Method and device for data processing and communication system comprising such device |
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| CN101836390A CN101836390A (en) | 2010-09-15 |
| CN101836390B true CN101836390B (en) | 2014-03-26 |
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| CN200880112829.3A Expired - Fee Related CN101836390B (en) | 2007-10-23 | 2008-10-22 | Method and device for data processing and communication system comprising such device |
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| US (1) | US8780739B2 (en) |
| EP (1) | EP2053774B1 (en) |
| JP (1) | JP5518724B2 (en) |
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| WO (1) | WO2009053386A1 (en) |
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| CN102550020B (en) * | 2009-10-02 | 2017-10-24 | 瑞典爱立信有限公司 | Use the method for recognizing the re-transmission of the verification sum of lost data packet |
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Also Published As
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|---|---|
| US8780739B2 (en) | 2014-07-15 |
| US20110310911A1 (en) | 2011-12-22 |
| CN101836390A (en) | 2010-09-15 |
| JP2011501592A (en) | 2011-01-06 |
| EP2053774A1 (en) | 2009-04-29 |
| WO2009053386A1 (en) | 2009-04-30 |
| EP2053774B1 (en) | 2013-05-08 |
| JP5518724B2 (en) | 2014-06-11 |
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